Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Class B Common Stock (Detail)

v3.5.0.2
Stockholders' Equity - Class B Common Stock (Detail) - Class B Common Stock - shares
 1 Months Ended 9 Months Ended
Aug. 31, 2016
May 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Class Of Stock [Line Items]                
Stock issued upon vesting of stock units 2016-08     2016-02        
Common stock conversion date 2016-08   2016-03          
Common stock issuance date   2016-05            
Common stock, shares outstanding         4,891,475 4,772,000 4,695,014 4,520,000
Class B common stock issued 241,628 9,198   4,911        
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock         59,000 134,000    
Resale And Registration Rights Agreement                
Class Of Stock [Line Items]                
Cancellation of Class B common stock upon conversion of Class B units to Class A common stock (21,200)   (38,076)